Sounds a bit too much like revenue raising.
Harsher penalties, sure, OR reduce it to 0.03 or 0.02l.
Complete intolerance is a bit too far. You could have a light beer with dinner and be done. Cough syrup and mouthwash will also get you caught.
I think doing this will work backwards. It'll be unfairly punishing the light drinkers. The heavy drinkers would have been done anyhow, just need more coppers doing RBTs. I've been driving for 9 years now and only had a single RBT.
Watch for the increase in alcohol sales and extra busy taxi drivers if/when that law comes in too.
But hey, safety isn't always the factor they're interested in. Its politics, they want to be out there and in the news. Also the government will do whatever they reckon will get them the more cash. Heard much about those studies proving that red-light cameras increase the number of accidents at intersections in the debates?